Energy Measurement Brochure

Energy Measurement
2012 Product Portfolio
N
L
SOC
Energy Measurement Redefined
MCU A
8k Flash
2 Serial Ports
AFE
As the high-precision leader in Analog Front End (AFE) ICs
for energy measurement since 1999, Cirrus Logic chips have
helped to drive revolutionary, cutting-edge products that are at
the heart of global smart grids and smart power applications.
Cirrus Logic’s broad family of AFE products
have each been developed around three
common principles:
Vin+/-
Shunt/
CT
Rogowski
lin+/-
Cirrus
Logic
548X
549X
Serial
MCU B
Pulse
32k Flash
LCD Driver
3 Serial Ports
MCU C
256k Flash
LCD Driver
5 Serial Ports
ƒƒ Highest precision measurement in the industry
ƒƒ Ease of use and flexibility
ƒƒ Lowest cost
New generations of energy measurement applications are
driving innovation beyond the utility meter. Smart plugs, smart
appliances and power supplies for intense-use applications
are enabling businesses, enterprises and even consumers to
more accurately account for their energy usage. Armed with
relevant data, consumers can now use that information to
make smarter decisions to manage their energy consumption.
Smart energy measurement is all about using
the electric grid more efficiently!
Cirrus Logic focuses solely on developing the best AFE
products in the semiconductor industry, freeing designers to
use the MCU of their choice in their design. This approach
enables customers to optimize performance and price on
every platform and provides flexibility across platforms to meet
changing market requirements.
The AFE+MCU Advantage
Designers have a fundamental choice for their application:
SOCs that offer a limited “one size fits all” approach, or a
dedicated MCU of their choice combined with a Cirrus
Logic AFE solutions with several benefits:
ƒƒ Highest measurement accuracy in
the industry, with low cost
ƒƒ Up to 10X faster calibration
ƒƒ Flexibility to tailor application to performance
needs and market demands
With this approach, each designer has the flexibility to
choose an MCU with the combination of memory, LCD
drive and I/O that is ideal for their specific application.
SOCs on the market today generally combine some AFE
functionality with predefined microcontroller functionality
in a single package. As the result, designers who use
SOCs often pay for unnecessary features (eg.
memory) and lesser performance — at a higher
cost.
Cirrus Logic AFEs offer the lowest noise level,
highest signal-to-noise ratios and best accuracy
available. Through pairing of the Cirrus Logic AFE
with the microcontroller of their choice, OEMs
have the ability to cost optimize their design
while also obtaining a device with superior
measurement accuracy (the Cirrus Logic AFE)
and the processing features and performance
that they select from among a host of MCU
vendors.
Using a Cirrus Logic AFE + MCU will help drive
down the bill of materials for any design task
while giving customers the flexibility to meet
rapidly changing market requirements.
Energy Management Product Portfolio
1
Digital Utility Meters
Cirrus Logic AFEs for digital utility meters have shaped the global
roll out of new generations of digital electric utility meters for
more than a decade. Working closely with leading global smart
meter OEMs, Cirrus has helped to define and build ICs that have
enabled the cost-effective deployment of high-accuracy smart
meters that have directly contributed to the development of
smart grids throughout the world.
Cirrus Logic’s advantages in this market:
HIGHEST ACCURACY: We understand accuracy requirements
driven by utilities and local regulators, and can help you meet
any global standard. Our accuracy performance is very flat over
a long range, and ultra-low noise level and high SNR make us the
market leader in accuracy.
LOW COST: We take deliberate efforts to keep our costs
extremely low. Optimizing die sizes, building our devices as
hard coded ROMs and avoiding expensive flash memory and
designing AFEs using cost optimized process technology allows
us to pass on the cost benefit to our customers.
A Smarter Approach
Cirrus Logic Analog Front Ends (AFEs) are the first choice for today’s
smart metering solutions.
Unlike expensive SOCs, our AFEs allow the flexibility of designing with a wide range of third-party
microcontrollers to optimize for your specific application requirements.
Don’t spend time worrying about how to make an SOC fit into your design. Make the smarter choice for
your metering needs with Cirrus Logic’s flexible, cost-effective AFE solutions.
2
For more information, visit www.cirrus.com
FAST CALIBRATION: Customers who want fast calibration need
not look any further than Cirrus AFEs. Due to our superior analog
performance, offset correction is very fast. With a calibration
time of 2-3 seconds, we are up to 10 times quicker than many
competing SOC solutions, which significantly speeds production.
FLEXIBILITY: Cirrus’ AFE approach allows the customers to lock
in the metrology portion of their designs across the globe and
free up their designers to focus on selecting the appropriate
MCU to satisfy the local requirements for communications, LCD
drive, IO etc.
EASE OF USE: Pre-programmed power calculation engine
eliminates any need for manual programming and also mitigates
security concerns.
Energy Management Product Portfolio
3
CS5490: Single-phase, 2-channel Utility Meter
CS5484: Single-phase 4-channel Utility Meter
(with shunt resistor)
0.1 uF
+3.3V
(2 current transformers or 2 Rogowski coils)
+3.3V
0.1 uF
0.1 uF
VVDA
MODE
5x400K
N
L2
+3.3V
27nF
1K 27nF
VIN-
TX
RX
5x200K
1K
5x200K
27nF
Meter
MCU
XOUT
IIN-
1K
27nF
4.096 MHz
27nF
1K
CT
Rb
27nF
1K
1K
1K
27nF
VREF+
LOAD
0.1 uF
+3.3V
D01
10K
CT
RESET
Rb
1K
1K
27nF
1K
+3.3V
VIN1-
0.1 uF
VIN2-
D03
D04
VIN2+
IIN1+
Zero Crossings
Interrupt
RX
TX
Meter
MCU
XIN
4.096 MHz
XOUT
IIN1-
VREF+
1K
+3.3V
VREFGNDA
+3.3V
Varh
VIN1+
CS5484
CS5490
TX
XIN
Shunt
1K
RX
IIN+
27nF
VDDD
D02
1K
1K
MODE
SSEL
0.1 uF
27nF
+3.3V
Wh
VVDA
D0
VIN+
27nF
1K
0.1 uF
Wh
VDDD
L1
1K
+3.3V
27nF
1.0 uF
IIN2-
0.1 uF
+3.3V
VREF-
IIN2+
10K
RESET
1.0 uF
LOAD
LOAD
CS
GNDA
GNDD
LOAD
CS5480: Single-phase, 3-channel Utility Meter
(current transformer and shunt resistor)
0.1 uF
+3.3V
0.1 uF
+3.3V
L
N
VVDA
1K
27nF
MODE
VDDD
VIN1+
SSEL
VIN1-
D01
+3.3V
Wh
Varh
+3.3V
27nF
1K
5x400K
0.1 uF
D02
1K
27nF
Shunt
1K
27nF
CT
1K
27nF
1K
RX
TX
TX
RX
27nF
4.096 MHz
IIN2-
0.1 uF
IIN2+
4
For more information, visit www.cirrus.com
CS
Cirrus Logic Solution
Benefits
CS5490
CS5484
CS5480
2, 3 or 4 channel
analog front end
High-performance 24-bit analog to
digital converters combined with a
proven power calculation engine.
Extremely high energy measurement accuracy
across a broad dynamic range. Proven power
calculation engine is built-in; user programming
is not required. Fast calibration minimizes time
required at the end of customer’s production line.
Analog front end approach enables customers to
maintain flexibility to choose the right application
processor for every platform, and adapt quickly
to changing requirements. Customers will never
pay for more memory, IO or performance than
required.
VREF+
+3.3V
VREF-
10K
RESET
LOAD
Description
Meter
MCU
XIN
IIN1-
XOUT
1K
1K
IIN1+
CS5480
D03
Product
GNDA
GNDD
1.0 uF
Energy Management Product Portfolio
5
3-phase Utility Meter — Non-Isolated Sensor
(shunt resistor)
3-phase Utility Meters
N
B
C
GND_A
27nF
GND_A
1K
MODE
VDDD
VIN1-
27nF
1K
VVDA
0.1 uF
+3.3V
+3.3V_1
0.1 uF
SSEL
VIN1+
GND
CS
5x400K
GND_A
1K
IIN1+
27nF
1K
27nF
GND_A
RX
Isolation
The following application diagrams show two alternate solutions for 3-phase utility meters.
The first requires three devices and is applied for non-isolated current sensors – typically
a shunt resistor. The second requires just two devices and applies to meter configurations
with isolated sensors, either current transformers or Rogowski coils.
A
+3.3V_1
CS5480
In an effort to provide the most accurate and cost effective three-phase solution possible.
Cirrus Logic utilizes multiple ICs to provide the required number of high-performance A/D
converters. Compared to many single-chip, 3-phase products with 6-8 channels built in, our
multichip solutions can cost more than 50 percent less!
0.1 uF
TX
XIN
IIN1-
4.096 MHz
XOUT
VREF+
+3.3V_1
0.1 uF
VREF-
10K
RESET
GNDA
1.0 uF
GNDD
GND_A
GND_B
1K
3-phase Utility Meter with Non-isolated Sensor
1K
VIN1+
27nF
27nF
GND_B
GND_B
Configuration
IIN1+
27nF
In the 3-phase configuration Phases A, B, and C are each connected to a separate CS5480 device to provide
required isolation. For current measurement, a shunt resistor on each phase is connected to a differential current
input on the CS5480. For voltage measurement, a resistor divider network between each phase and neutral is
connected to the voltage channel.
27nF
GND_B
VDDD
GND_B
+3.3V_2
SSEL
VIN1-
1K
1K
MODE
0.1 uF
CS
RX
CS5480
5x400K
VVDA
GND_A
TX
XIN
IIN1-
Meter
MCU
Isolation
0.1 uF
+3.3V_2
4.096 MHz
XOUT
VREF+
+3.3V_2
0.1 uF
VREF-
10K
RESET
GNDA
1.0 uF
GNDD
GND_B
0.1 uF
GND_C
1K
5x400K
27nF
GND_C
GND_C
Each CS5480 contains independent 24-bit analog to digital converters (ADCs). The sample rate of each converter
is 4k/sps. The meter MCU can read raw sample data from each converter at this data rate and perform power
calculations outside of the CS5480.
1K
Another option is to utilize the proven onboard power calculation engine to perform power calculations on-chip. In
this configuration, the calculation engine reads the raw data from the ADC channels, performs power calculations,
and stores the results in registers for the application processor to read via the serial port. On-chip calculations
include instantaneous voltage, current and power, Vrms, Irms, active power, reactive power, apparent power, and
power factor. Summation of these values across phases is done in the meter MCU. In addition, the CS5480 has
included functionality for phase sequence detection and phase angle calculations often required in 3-phase
applications.
6
For more information, visit www.cirrus.com
27nF
GND_C
0.1 uF
VDDD
GND_C
+3.3V_3
SSEL
VIN1-
IIN1+
27nF
1K
MODE
VIN1+
27nF
1K
VVDA
GND_B
CS
CS5480
Operation
+3.3V_3
RX
TX
Isolation
Serial communication between each CS5480 and the utility meter MCU is via UART to minimize isolation costs. The
applications processor must provide three digital outputs for chip select (CS) one for each CS5480.
TX
RX
XIN
IIN1-
4.096 MHz
XOUT
VREF+
+3.3V_3
0.1 uF
VREFLOAD
LOAD
10K
RESET
GNDA
LOAD
GNDD
1.0 uF
GND_C
GND_C
Energy Management Product Portfolio
7
3-phase Utility Meter – Isolated Sensor
(current transformer or Rogowski coil)
0.1 uF
A
N
B
C
+3.3V
VVDA
0.1 uF
MODE
VDDD
+3.3V
+3.3V_1
0.1 uF
SSEL
3-phase Utility Meter with Isolated Sensor
1K
5x400K
27nF
VIN1-
1K
Configuration
1K
CT
Rb
1K
1K
27nF
VIN2-
27nF
5x400K
27nF
1.0 uF
CS
VIN2+
1K
Clock Synchronization
CT
Rb
1K
1K
IIN2+
27nF
1K
27nF
10K
RESET
IIN1-
1K
1K
+3.3V
IIN1+
27nF
1K
CS5484
In the 3-phase wye configuration, Phases A and B are connected to the first CS5484 (top in the diagram) and Phase
C is connected to the second CS5484 (bottom in the diagram). For current measurement, a current transformer on
each phase is connected to a differential current input on the CS5484. For voltage measurement, a resistor divider
network between each phase and neutral is connected to the voltage channel. In a standard configuration of three
current and three voltage measurements, the second CS5484 is deployed with an unused current channel (IIN2)
and voltage channel (VIN2). These additional channels allow for the option of a Neutral Current measurement for
tamper detection, and an additional voltage channel for alternate functionality.
VIN1+
27nF
RX
TX
TX
RX
XIN
IIN2-
4.096 MHz
XOUT
The first CS5484 is connected to an external crystal to provide its clock source. The first CS5484 has a CPUCLK
output that provides a synchronized clock source to second CS5484. This arrangement enables synchronous
sampling of all voltage and current channels on both devices.
Meter
MCU
VREF+
0.1 uF
CPUCLK
VREF-
Communication
GNDA
Serial communication between each CS5484 is via SPI. The CS5484 SPI port operates at up to 2Mbps. A single
SPI port is required on the applications processor. In addition, the applications processor must provide two digital
outputs for chip select (CS) one for each CS5484.
0.1 uF
+3.3V
VVDA
1K
1K
Operation
0.1 uF
MODE
27nF
SSEL
XIN
VIN1-
CS
1K
CT
Rb
1K
1K
IIN1+
27nF
1K
27nF
IIN1VREF+
CS5484
Each CS5484 contains four independent 24-bit analog to digital converters (ADCs). With a sample rate for each
converter of 4ksps, the applications processor can read raw sample data from each converter at this data rate and
perform power calculations outside of the CS5484.
VDDD
+3.3V
VIN1+
27nF
5x400K
GNDD
RX
TX
0.1 uF
VREF-
Another option is to utilize the proven onboard power calculation engine to perform power calculations on-chip. In
this configuration, the calculation engine reads the raw data from the ADC channels, performs power calculations,
and stores the results in registers for the meter MCU to read via the serial port. On-chip calculations include
instantaneous voltage, current and power, Vrms, Irms, active power, reactive power, apparent power, and power factor.
Summation of these values across phases is done in the utility meter MCU. In addition, the CS5484 has included
functionality for phase sequence detection and phase angle calculations often required in 3-phase applications.
8
For more information, visit www.cirrus.com
1K
Rb
CT
LOAD
1K
1K
27nF
1K
27nF
IIN2+
+3.3V
GNDA
LOAD
10K
RESET
IIN2-
GNDD
1.0 uF
LOAD
Energy Management Product Portfolio
9
Smart Appliances
To effectively monitor energy usage within the home,
consumers need to understand how their appliances — washing
machines, dryers, refrigerators, etc., — consume electricity. For
this reason, a new breed of wireless-enabled “smart appliances”
have emerged as one of the fastest-growing segments of the energy
measurement market.
If consumers can, in effect, itemize the consumption, they are empowered
with the knowledge to make informed decisions to better manage and optimize
overall consumption habits or even perhaps remedy a malfunctioning device: Is the
refrigerator consuming unusually large amounts of electricity? Perhaps the motor is breaking
down and needs replacing? If my utility has reduced per-kilowatt-hour pricing at night, perhaps it’s less
expensive to operate the dryer during that time?
Smart appliances are able to monitor and report energy consumption, perform advanced diagnostics based
on energy use, automatically respond to utility signals for time-of-use rate changes and service malfunctioning
devices. These functions provide cost savings to utilities as well as consumers.
L
VVDA
1K
5x400K
1K
27nF
27nF
Smart appliances (eg. washers/dryers and refrigerators) smart
powerstrips/smart plugs and power supplies used in commercial
applications like servers can now more than ever cost effectively provide
highly accurate information to the user.
1K
Shunt
27nF
1K
27nF
0.1 uF
MODE
VDDD
VCC
VIN+
RX
VIN-
IIN1+
TX
TX
ISOLATION
Beyond the utility meter, emerging applications in
power monitoring are changing how consumers and
businesses think about — and manage — electricity
consumption.
N
+3.3V
CS5490
Smart Power
Smart Appliances
0.1 uF
RESET
GPIO
XIN
4.096 MHz
XOUT
IIN1-
RX
Wireless
MCU
(Zigbee/Wifi)
VREF+
0.1 uF
In any application where high precision, low cost and ease of use matter
to the system designer, Cirrus Logic offers a tailor-made IC — providing just
the right level of features and performance.
10
For more information, visit www.cirrus.com
VREF-
LOAD
GNDA
Energy Management Product Portfolio
11
Smart Power Supply
Smart Plug / Smart Strips
Smart power supply monitoring systems are designed for measuring and
relaying energy usage information in high-performance systems such as servers,
telecommunications racks, storage racks and PCs. Continuously increasing
demand for computer resources such as cloud computing has resulted in
exponential growth in the number of data center servers.
Smart plugs and smart powerstrips were, until recent years, unknown consumer
devices. These products are a rapidly growing segment of the energy measurement
market that is being driven by consumers seeking real-time information about the
electricity usage of household products: computers, displays, cable boxes, home
theater systems, lamps, etc.
Cirrus Logic understands the challenge this presents to IT managers and
equipment manufacturers, and through its portfolio of energy measurement ICs, it
partners with them to create green data centers through energy efficient solutions such as
power-managed servers.
While features vary by manufacturer, smart plugs are outlets that plug into regular
household outlets and monitor energy consumption. Via optimized remote on-off
control, they enable a reduction in overall energy consumption. Some smart plugs/
smart strips use wireless communication, such as Zigbee or Wi-Fi, to connect to a
USB hub that plugs into a home or office computer and compile information from measuring the various devices
within the home. In addition, this hub can provide automation to reduce consumption by automatically turning off
unused loads.
Cirrus Logic works closely with power supply OEMs to make their initial implementation of an energy measurement
function in a power supply easy and affordable. To meet OEMs’ growing demand for cost-effective implementation,
Cirrus’ new CS548X/9X family features built-in calculations and very fast calibration, which speeds production
cycles and enables customers to use low-cost manufacturing locations.
Low-cost AFE solutions from Cirrus Logic are critical components to meet the cost-sensitive and rapidly-changing
requirements of the consumer market.
N
L
VVDA
1K
5x400K
1K
27nF
27nF
27nF
1K
27nF
MODE
VDDD
VCC
Server Host
Processor
N
L
1K
5x400K
1K
27nF
27nF
RX
VIN-
IIN1+
TX
RESET
TX
XIN
GPIO
Power
Supply MCU
Shunt
XOUT
27nF
1K
27nF
MODE
VIN-
RX
P
M
B
U
S
0.1 uF
IIN1+
GNDA
12
For more information, visit www.cirrus.com
RX
TX
TX
RX
RESET
GPIO
XIN
4.096 MHz
IIN1-
Wireless
MCU
(Zigbee/Wifi)
VREF+
0.1 uF
0.1 uF
VREF-
+3.3 V
XOUT
VREF+
LOAD
VDDD
VIN+
1K
4.096 MHz
IIN1-
+3.3V
VVDA
VIN+
1K
Shunt
0.1 uF
ISOLATION
upply
ng
Smart Plugs
+3.3V
CS5490
0.1 uF
0.1 uF
CS5490
Cirrus’ components enable extremely accurate measurement of energy consumption, allowing data centers to
optimize server utilization for efficiency and better return on investment.
VREF-
LOAD
GNDA
Energy Management Product Portfolio
13
CS5484
The CS5484 is a high performance analog front end solution for energy measurement with four 24-bit analog
to digital converters. It provides high-accuracy energy measurement at a very low price, and on-chip energy
calculations and fast on-chip calibration speeds product development cycles. Flexibility in current sensors, serial
communications and digital outputs ensures that the CS5484 is a fit for any application requiring high-accuracy
energy measurement at a very low price.
CS5484/80/90
Energy Measurement ICs
VDDA
VDDD
RESET
IIN1+
4th Order
PGA
SSEL
HPF
Option
Digital Filter
ΔΣ Modulator
IIN1-
CS
UART/SPI
Serial
Interface
IIN2+
4th Order
PGA
HPF
Option
Digital Filter
ΔΣ Modulator
IIN2-
RX/SDI
TX/SDO
SCLK
VIN1+
4th Order
10x
VIN1-
HPF
Option
Digital Filter
ΔΣ Modulator
DO1
Calculation
Configurable
Digital
Outputs
VIN2+
10x
VIN2-
M
U
X
4th Order
ΔΣ Modulator
Temperature
Sensor
HPF
Option
Digital Filter
System
Clock
Voltage
Reference
Clock Generator
XIN XOUT
CPUCLK
DO3
DO4
MODE
GNDA
DO2
VREF+
VREF-
GNDD
Features:
ƒƒ Superior analog performance with ultra-low
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
Cirrus Logic’s EXL Core® is a unique digital approach to developing green
energy products. It represents more than 100 patents in signal processing
innovation via complex algorithms along with analog peripherals.
14
For more information, visit www.cirrus.com
ƒƒ
noise level and high SNR
Energy measurement accuracy of 0.1% over
4000:1 dynamic range
Current RMS measurement accuracy of 0.1�
over 1000:1 dynamic range
4 independent 24 bit, 4th order Delta-Sigma
modulators for voltage and current
measurements
4 configurable digital outputs for energy pulses,
zero crossing or energy direction
Supports shunt resistor, CT and Rogowski coil
current sensors
Overcurrent, voltage sag and voltage swell
detection
ƒƒ UART / SPI serial interface
ƒƒ Internal register protection via checksum
ƒƒ
ƒƒ
ƒƒ
ƒƒ
and write-protection
On-chip voltage reference (25 ppm/°C typ.)
Single 3.3V power supply
Low power consumption: < 13mW
5mm x 5mm 28-pin QFN package
On-chip measurements / calculations:
ƒƒ
ƒƒ
ƒƒ
ƒƒ
Active, reactive and apparent power
RMS voltage and current
Power factor and line frequency
Instantaneous voltage, current and power
Energy Management Product Portfolio
15
CS5480
CS5490
The CS5480 is a high performance analog front end solution for energy measurement with three 24-bit analog
to digital converters. It provides high-accuracy energy measurement at a very low price, and on-chip energy
calculations and fast on-chip calibration speeds product development cycles. Flexibility in current sensors, serial
communications and digital outputs ensures that the CS5484 is a fit for any application requiring high-accuracy
energy measurement at a very low price.
The CS5490 is a high performance analog front end solution for energy measurement with two 24-bit analog
to digital converters. It provides high-accuracy energy measurement at a very low price, and on-chip energy
calculations and fast on-chip calibration speeds product development cycles. Flexibility in current sensors and
digital outputs ensures that the CS5490 is a fit for any application requiring high-accuracy energy measurement at
a very low price.
VDDA
VDDD
RESET
VDDA
IIN1+
4th Order
ΔΣ Modulator
PGA
IIN1-
HPF
Option
Digital Filter
IIN+
CS
UART/SPI
Serial
Interface
IIN2+
4th Order
ΔΣ Modulator
PGA
IIN2-
HPF
Option
Digital Filter
4th Order
PGA
ΔΣ Modulator
IIN-
RX/SDI
UART
Serial
Interface
VIN+
4th Order
ΔΣ Modulator
10x
4th Order
ΔΣ Modulator
10x
VIN-
HPF
Option
Digital Filter
VIN-
VREF -
Voltage
Reference
Calculation
DO3
VREF -
Temperature
Sensor
System
Clock
Configurable
Digital
Output
DO2
VREF+
Voltage
Reference
RX
TX
HPF
Option
Digital Filter
DO1
Calculation
Energy To
Pulse
Conversion
VREF+
HPF
Option
Digital Filter
TX/SDO
SCLK
VIN+
VDDD
RESET
SSEL
DO1
Temperature
Sensor
System
Clock
Clock Generator
Clock Generator
MODE
GNDA
GNDA
XIN
XOUT
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
16
noise level and high SNR
Energy measurement accuracy of 0.1% over
4000:1 dynamic range
Current RMS measurement accuracy of 0.1�
over 1000:1 dynamic range
3 independent 24 bit, 4th order Delta-Sigma
modulators for voltage and current
measurements
3 configurable digital outputs for energy pulses,
zero crossing or energy direction
Supports shunt resistor, CT and Rogowski coil
current sensors
Overcurrent, voltage sag and voltage swell
detection
For more information, visit www.cirrus.com
XOUT
GNDD
Features:
Features:
ƒƒ Superior analog performance with ultra-low
XIN
GNDD
ƒƒ UART / SPI serial interface
ƒƒ Internal register protection via checksum and
ƒƒ
ƒƒ
ƒƒ
ƒƒ
write-protection
On-chip voltage reference (25 ppm/°C typ.)
Single 3.3V power supply
Low power consumption: < 13mW
4mm x 4mm 24-pin QFN package
On-chip measurements / calculations:
ƒƒ
ƒƒ
ƒƒ
ƒƒ
Active, reactive and apparent power
RMS voltage and current
Power factor and line frequency
Instantaneous voltage, current and power
ƒƒ Superior analog performance with ultra-low
ƒƒ Internal register protection via checksum and
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
ƒƒ
noise level and high SNR
Energy measurement accuracy of 0.1% over
1000:1 dynamic range
2 independent 24 bit, 4th order Delta-Sigma
modulators for voltage and current
measurements
Configurable digital output for energy pulses,
zero crossing or energy direction
Supports shunt resistor, CT and Rogowski coil
current sensors
Overcurrent, voltage sag and voltage swell
detection
UART serial interface
write-protection
On-chip voltage reference (25 ppm/°C typ.)
Single 3.3V power supply
Low power consumption: < 13mW
16-pin SOIC package
On-chip measurements / calculations:
ƒƒ
ƒƒ
ƒƒ
ƒƒ
Active, reactive and apparent power
RMS voltage and current
Power factor and line frequency
Instantaneous voltage, current and power
Energy Management Product Portfolio
17
Performance Statistics
Product Selector Table
Active Energy Accuracy
Lagging PF = 0.5
Leading PF = 0.5
PF = 1.0
Percent Error (%)
1.0
0.5
0.0
-0.5
Part
CS5484
CS5480
CS5490
CS5467
CS5464
CS5463
CS5451A
ADC Converters
4
3
2
4
3
2
6
Current Sensor
Options
Shunt/CT/
Rogowski
Shunt/CT/
Rogowski
Shunt/CT/
Rogowski
Shunt/CT
Shunt/CT
Shunt/CT
Shunt/CT
Active Energy
Accuracy
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over
1000:1 dynamic
range
0.1% over
1000:1 dynamic
range
0.1% over
1000:1 dynamic
range
N/A
Reactive Energy
Accuracy
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.2% over
1000:1 dynamic
range
0.2% over
1000:1 dynamic
range
0.2% over
1000:1 dynamic
range
N/A
IRMS Accuracy
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over
1000:1 dynamic
range
0.1% over
1000:1 dynamic
range
0.2% over
1000:1 dynamic
range
N/A
SNR
80dB
80dB
80dB
78dB
78dB
78dB
77dB
Serial
Communication
SPI/ UART
SPI/ UART
UART
SPI
SPI
SPI
SPI
Digital Outputs
4x Configurable
Outputs
3x Configurable
Outputs
Single
Configurable
Output
Energy Pulses
Energy Pulses
Energy Pulses
-
VREF Drift
25ppm/C
25ppm/C
25ppm/C
40ppm/C
40ppm/C
40ppm/C
25ppm/C
Input Voltage
3.3V
3.3V
3.3V
5V Analog
3.3/5V Digital
5V Analog
3.3/5V Digital
5V Analog
3.3/5V Digital
3V
Analog
3V Digital
Power
Consumption
< 13mW
< 13mW
< 13mW
25mW
25mW
21mW
23mW
Package
28 QFN
24 QFN
16 SOIC
28 SSOP
28 SSOP
24 SSOP
28 SSOP
-1.0
05
00
1000
1500
2000
2500
3000
3500
4000
4500
Current Dynamic Range (x:1)
Reactive Energy Accuracy
Lagging sin(φ) = 0.5
Leading sin(φ) = 0.5
sin(φ) = 1.0
Percent Error (%)
1.0
0.5
0.0
-0.5
-1.0
05
00
1000
1500
2000
2500
3000
3500
4000
4500
Current Dynamic Range (x:1)
IRMS Accuracy
IRMS Error
Percent Error (%)
1.0
0.5
0.0
-0.5
-1.0
05
18
For more information, visit www.cirrus.com
00
1000
1500
Energy Management Product Portfolio
19
CDB5484-3P
Reference Design
CRD5490
The CRD5490 is an easy-to-use, small formfactor, power monitoring reference design.
In a package the size of a business card, it
gives designers access to all of the on-chip
measurements of the CS5490 via an
easy-to-use PC interface. User
programming is NOT required for
accurate measurements of
line voltage, loadcurrent, line
frequency, active power,
reactive power, apparent
power and power factor.
Plug one side into the wall for power
and plug any load into the universal
adapter, and within seconds you will be
making real time measurements of power
consumption. Power supply, shunt resistor,
required isolation and shunt resistor are all
included.
The CRD5490 is a great reference design for
power supply monitoring, smart plugs, smart
appliances or any other application that requires
easy to use energy measurement in a very small
form factor. Communication protocol, GUI, and
MCU software source code are available from
Cirrus Logic and can be tweaked for the specific
needs of your system.
20
For more information, visit www.cirrus.com
The CDB5484-3P is an extensive tool designed to
evaluate the functionality and performance of Cirrus
Logic's 3-phase solution using 2x CS5484. It supports
a Delta or wye configuration with either current
transformers or Rogowski coils. With a total of
8 analog inputs, current and voltage for all
three phases can be measured, as well
as an additional current channel for
neutral monitoring. Three-phase power
calculations, clock synchronization and
phase angle measurement functionality can
all be evaluated on this easy to use development
board. Intuitive GUI software provides easy and
full access to the on-board CS5484 devices and the
MCU. Onboard LEDs and LCD display enable standalone
operation for extended testing. Getting started with a CDB
enables fast and easy preliminary evaluation of Cirrus
Logic's low cost three-phase solutions.
Development
Boards
CDB5484/80/90U
The CDB5484/80/90U boards are designed to
evaluate the functionality and performance of
the CS5484/80/90 energy measurement IC
family. Shunt resistors, current transformers or
Rogowski coils can be connected to the analog
inputs. Intuitive GUI software provides easy and
full access to the on-board CS5484/80/90 device
and MCU. On-board LEDs and LCD displays enable
stand alone operation for extended testing. These
CDBs enable fast and easy preliminary evaluation
of Cirrus Logic's AFE products.
Energy Management Product Portfolio
21
Cirrus Logic, Inc.
2901 Via Fortuna
Austin, Texas 78746
United States
T+1 512-851-4000
F+1 512-851-4977
Toll-Free +800-888-5016
Sales Support
North America +1 800-625-4084
Asia Pacific +852 2376-0801
Japan +81 (3) 5226-7757
Europe/UK +44 (90) 1628-891-300
www.cirrus.com
© 2012 Cirrus Logic, Inc. All rights reserved. Cirrus Logic, Cirrus, the Cirrus Logic logo designs, EXL Core,
and the EXL Core logo design are trademarks of Cirrus Logic, Inc.